.TH std::boolalpha,std::noboolalpha 3 "2024.06.10" "http://cppreference.com" "C++ Standard Libary"
.SH NAME
std::boolalpha,std::noboolalpha \- std::boolalpha,std::noboolalpha

.SH Synopsis
   Defined in header <ios>
   std::ios_base& boolalpha( std::ios_base& str );   \fB(1)\fP
   std::ios_base& noboolalpha( std::ios_base& str ); \fB(2)\fP

   1) Enables the boolalpha flag in the stream str as if by calling
   str.setf(std::ios_base::boolalpha).
   2) Disables the boolalpha flag in the stream str as if by calling
   str.unsetf(std::ios_base::boolalpha).

   std::boolalpha is an I/O manipulator, so it may be called with an expression such as
   out << std::boolalpha for any out of type std::basic_ostream or with an expression
   such as in >> std::boolalpha for any in of type std::basic_istream.

.SH Parameters

   str - reference to I/O stream

.SH Return value

   str (reference to the stream after manipulation).

.SH Example


// Run this code

 #include <iostream>
 #include <sstream>

 int main()
 {
     // boolalpha output
     std::cout << "default true: " << true << '\\n'
               << "default false: " << false << '\\n'
               << std::boolalpha
               << "boolalpha true: " << true << '\\n'
               << "boolalpha false: " << false << '\\n'
               << std::noboolalpha
               << "noboolalpha true: " << true << '\\n'
               << "noboolalpha false: " << false << '\\n';

     // boolalpha parse
     bool b1, b2;
     std::istringstream is("true false");
     is >> std::boolalpha >> b1 >> b2;

     std::cout << '"' << is.str() << "\\" parsed as: "
               << std::boolalpha << b1 << ' ' << b2 << '\\n';
 }

.SH Output:

 default true: 1
 default false: 0
 boolalpha true: true
 boolalpha false: false
 noboolalpha true: 1
 noboolalpha false: 0
 "true false" parsed as: true false

.SH See also

   resetiosflags clears the specified ios_base flags
                 \fI(function)\fP
   setiosflags   sets the specified ios_base flags
                 \fI(function)\fP
   do_truename   provides the string to use as the name of the boolean true and false
   do_falsename  \fI(virtual protected member function of std::numpunct<CharT>)\fP
   \fB[virtual]\fP
